Transition metal complexes and polymerization catalysts

ABSTRACT

There are provided a transition metal complex of formula (1): 
                         
wherein M represents an element of Group 6 of Periodic Table of Elements, A and A′ are the same or different, and represent a substituted or unsubstituted C1-10 alkylene group or the like, Y represents a substituted or unsubstituted C1-10 alkyl group, or the like, X 1  and X 2  are the same or different, and represent a hydrogen atom, a halogen atom, a substituted or unsubstituted C1-10 alkyl group, or an amino group disubstituted with C1-20 hydrocarbon, and n 1  is an integer of 0 to 3, an olefin polymerization catalyst obtained by combining a transition metal complex with an organic aluminum or aluminoxane, a polymerization catalyst further containing a boron compound, and a process for producing olefin polymer using the polymerization catalyst.

TECHNICAL FIELD

The present invention relates to transition metal complexes, olefinpolymerization catalysts and a process for preparing olefin polymers.

Backgroun Technique

WO87/02370 reports that2,2′-thiobis(6-tert-butyl-4-methylphenoxy)titanium dichloride is used asa component of an olefin polymerization catalyst, and JP-A No. 10-218922reports that2,2′-(phenylphosphido)bis(6-tert-butyl-4-methylphenoxy)(tetrahydrofuran)titaniumdichloride is used as a component of an olefin polymerization catalyst.However, these catalysts are not industrially necessarily satisfactoryin their activity.

DISCLOSURE OF THE INVENTION

According to the present invention, an olefin polymerization catalysthaving better activity is obtained from a novel transition metalcomplex, and olefin polymers can be industrially advantageously preparedby a method of polymerizing olefin using the catalyst.

That is, the present invention provides

a transition metal complex of formula (1):

wherein M represents an element of Group 6 of Periodic Table ofElements,

A and A′ are the same or different and represent

a substituted or unsubstituted C1-10 alkylene group,

a substituted or unsubstituted C6-18 phenylene group,

a substituted or unsubstituted C10-20 naphthylene group or

a silylene group substituted with a substituted or unsubstituted C1-20hydrocarbon,

Y represents a substituted or unsubstituted C1-10 alkyl group,

a substituted or unsubstituted C7-20 aralkyl group,

a substituted or unsubstituted C6-20 aryl group or

a silyl group substituted with a substituted or unsubstituted C1-20hydrocarbon,

X¹ and X² are the same or different, and represent

a hydrogen atom, a halogen atom,

a substituted or unsubstituted C1-10 alkyl group,

a substituted or unsubstituted C7-20 aralkyl group,

a substituted or unsubstituted C6-20 aryl group,

a substituted or unsubstituted C1-10 alkoxy group,

a substituted or unsubstituted C7-20 aralkyloxy group,

a substituted or unsubstituted C6-20 aryloxy group, or

an amino group disubstituted with C1-20 hydrocarbon, and

n¹ is an integer of 0 to 3;

an olefin polymerization catalyst which is obtained by combining thetransition metal complex with the following compound (A):

compound (A): any one of the following compounds (A₁) to (A₃), or amixture of two or more of them

(A₁): an organic aluminum compound of formula: (E₁)_(a)Al(Z′)_((3-a)),

(A₂): cyclic aluminoxane having a structure of formula:{—Al(E₂)-O—}_(b),

(A₃): linear aluminoxane having a structure of formula:(E₃){—Al(E₃)-O—}_(c)Al(E₃)₂

wherein E₁ to E₃ are the same or different, and represent a C1-8hydrocarbon group, Z's are the same or different and represent ahydrogen atom or a halogen atom,

a represent 1, 2 or 3,

b represents an integer of 2 or more, and

c represent an integer of 1 or more;

an olefin polymerization catalyst which is obtained by combining theaforementioned olefin polymerization catalyst and the following compound(B):

compound (B): any one of the following compounds (B₁) to (B₃), or amixture of two or more of them:

(B₁): a boron compound of formula BQ₁Q₂Q₃,

(B₂): a boron compound of formula Z⁺(BQ₁Q₂Q₃Q₄)⁻,

(B₃): a boron compound of formula (L-H)⁺(BQ₁Q₂Q₃Q₄)⁻

wherein B is a trivalent boron atom,

Q₁ to Q₄ are the same or different and represent a halogen atom, a C1-20hydrocarbon group, a halogenated C1-20 hydrocarbon group, a silyl groupsubstituted with C1-20 hydrocarbon,

an C1-20 alkoxy group, or

an amino group disubstituted with C1-20 hydrocarbon,

Za⁺ represents an inorganic or organic cation, and

L represents a neutral Lewis base;

a process for preparing an olefin polymer utilizing the polymerizationcatalyst, and

a process for preparing a transition metal complex of formula (1), whichprocess comprise reacting a compound of formula (3):

wherein Y, A and A′ are as defined above, with a transition metalcompound of formula (4):

wherein M represents an element of Group 6 of Periodic Table ofElements,

X³, X⁴ and X⁵ are the same or different, and represent

a hydrogen atom, a halogen atom,

a substituted or unsubstituted C1-10 alkyl group,

a substituted or unsubstituted C7-20 aralkyl group,

a substituted or unsubstituted C6-20 aryl group,

a substituted or unsubstituted C1-10 alkoxy group,

a substituted or unsubstituted C7-20 aralkyloxy group,

a substituted or unsubstituted C6-20 aryloxy group, or

an amino group disubstituted with C1-20 hydrocarbon,

L₀ represents a neutral ligand selected from ether, sulfide, amine,phosphine or olefin, and

l′, m′ and n′ represent independently an integer of 0 to 2.

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be explained in detail below.

Examples of the substituted or unsubstituted C1-10 alkylene group offormula A or A′ in the compound of formula (1) or (3) include, forexample, a group of formula:

wherein R⁹ and R¹⁰ represent the substituents as defined below and n² isan integer of 1 to 10.

Examples of the substituted or unsubstituted C6-18 phenylene grouprepresented by A or A′ in the compound of formula (1) or (3) include agroup of formula:

wherein R¹¹ is as defined below, and n³ is an integer of 1 to 3.

Examples of the substituted or unsubstituted C10-20 naphthylene group offormula: A or A′ in the compound of formula (1) or (3) include, forexample, a group of formula:

wherein R¹² represents the substituents as defined below, and n⁴ is 1 or2.

Examples of the substituted or unsubstituted silynene group substitutedwith C1-20 hydrocarbon, represented by A, or A′ in the compound offormula (1) or (3) include, for example, a group of formula:

wherein R¹³ and R¹⁴ are as defined below, and n⁵ is 1 or 2.

In the aforementioned formulas, R⁹, R¹⁰, R¹¹, R¹², R¹³ and R¹⁴ are thesame or different, and represent a hydrogen atom, a halogen atom, asubstituted or unsubstituted C1-10 alkyl group, a substituted orunsubstituted C1-10 alkoxy group, or a silyl group substituted withC1-20 hydrocarbon. n²and n³ are preferably 1 or 2.

Examples of the halogen atom in R⁹ to R¹⁴include a fluorine atom, achlorine atom, a bromine atom and an iodine atom, and preferred is achlorine atom.

Examples of the unsubstituted C1-10 alkyl group in R⁹ to R¹⁴ include amethyl group, an ethyl group, a n-propyl group, an isopropyl group, an-butyl group, a sec-butyl group, a tert-butyl group, a n-pentyl group,a neopentyl group, an amyl group, a n-hexyl group, a n-octyl group, an-nonyl group, and a n-decyl group. Examples of the substituted C1-10alkyl group include an C1-10 alkyl group substituted with a substituentselected from the group consisting of a halogen atom (e.g. a fluorineatom or a chlorine atom etc.), an alkoxy group (e.g. a methoxy groupetc.), an aryloxy group (e.g. a phenoxy group etc.), an amino groupsubstituted with hydrocarbon (e.g. a dimethylamino group etc.) and asilyl group substituted with hydrocarbon (e.g. a trimethylsilyl groupetc.), and specific examples thereof include a fluoromethyl group, adifluoromethyl group, a trifluoromethyl group, a fluoroethyl group, adifluoroethyl group, a trifluoroethyl group, a tetrafluoroethyl group, apentafluoroethyl group, a perfluoropropyl group, a perfluorobutyl group,a perfluoropentyl group, a perfluorohexyl group, a perfluorooctyl group,a perfluorodecyl group, a trichloromethyl group, a methoxymethyl group,a phenoxymethyl group, a dimethylaminomethyl group, and atrimethylsilylmethyl group. Among them, a methyl group, an ethyl group,an isopropyl group, a tert-butyl group, and an amyl group are preferred,and a more preferred is a tert-butyl group.

In R⁹ to R¹⁴, examples of the unsubstituted C1-10 alkoxy group include amethoxy group, an ethoxy group, a n-propoxy group, an isopropoxy group,a n-butoxy group, a sec-butoxy group, a tert-butoxy group, a n-pentyloxygroup, a neopentyloxy group, a n-hexyloxy group, a n-octyloxy group, an-nonyloxy group, and a n-decyloxy group. Examples of the substitutedC1-10 alkoxy group include an C1-10 alkoxy group substituted with asubstituent selected from the group consisting of a halogen atom (e.g. afluorine atom or a chlorine atom etc.), an alkoxy group (e.g. a methoxygroup, an ethoxy group etc.), an aryloxy group (e.g. an phenoxy groupetc.), an amino group substituted with hydrocarbon (e.g. a dimethylaminogroup etc.) and a silyl group substituted with hydrocarbon (e.g. atrimethysilyl group etc.). Examples the substituted alkoxy groupinclude, for example, a fluoromethoxy group, a difluoromethoxy group, atrifluoromethoxy group, a fluoroethoxy group, a difluoroethoxy group, atrifluoroethoxy group, a tetrafluoroethoxy group, a pentafluoroethoxygroup, a perfluoropropoxy group, a perfluorobutyloxy group, aperfluoropentyloxy group, a perfluorohexyloxy group, a perfluorooctyloxygroup, a perfluorodecyloxy group, a trichloromethoxy group, amethoxymethyl group, a phenoxymethoxy group, a dimethylaminomethoxygroup, and a trimethylsilylmethoxy group. Preferred alkoxy group are amethoxy group, an ethoxy group and a tert-butoxy group.

In R⁹ to R¹⁴, examples of the hydrocarbon group of the silyl groupsubstituted with substituted or unsubstituted C1-20 hydrocarbon includean C1-10 alkyl group such as a methyl group, an ethyl group, a n-propylgroup, an isopropyl group, a n-butyl group, a sec-butyl group, atert-butyl group, a n-pentyl group, a neopentyl group, an amyl group, an-hexyl group, a cyclohexyl group, a n-octyl group, a n-nonyl group, ora n-decyl group, and an C6-20 aryl group such as a phenyl group, a tolylgroup, a xylyl group, a naphtyl group, or an anthracenyl group.

Examples of the silyl group substituted with the C1-20 hydrocarboninclude a monosubstitued silyl group such as a methylsilyl group, anethylsilyl group, and a phenysilyl group, a disubstitued silyl groupsuch as a dimethylsilyl group, a diethylsilyl group, a diphenylsilylgroup, and a trisubstitued silyl group such as a trimethylsilyl group, atriethylsilyl group, a tri-n-propylsilyl group, a tri-isopropylsilylgroup, a tri-n-butylsilyl group, a tri-sec-butylsilyl group, atri-tert-butylsilyl group, a tri-isobutylsilyl group, atert-butyldimethylsilyl group, a tri-n-pentylsilyl group, atri-n-hexylsilyl group, a tricyclohexylsilyl group, and a triphenylsilylgroup, preferably a trimethylsilyl group, a tert-butyldimethylsilylgroup, and a triphenylsilyl group. Examples of the silyl groupsubstituted with substituted C1-20 hydrocarbon include a silyl groupsubstituted with a halogen (e.g. a fluorine atom)-substituted C1-20hydrocarbon group.

Preferred transition metal complex of formula (1) is a transition metalcomplex wherein A and A′ is a substituted or unsubstituted C6-18phenylene group, and is represented by formula (2):

wherein M represents an element of Group 6 of Periodic Table ofElements, Y represents a substituted or unsubstituted C1-10 alkyl group,a substituted or unsubstituted C7-20 aralkyl group, a substituted orunsubstituted C6-20 aryl group, a silyl group substituted with asubstituted or unsubstituted C1-20 hydrocarbon,

R¹, R², R³, R⁴, R⁵, R⁶, R⁷ and R⁸ are the same or different, andrepresent a hydrogen atom, a halogen atom, an C1-10 alkyl group, anC1-10 alkoxy group, or a silyl group substituted with a C1-20hydrocarbon,

X¹ and X² are the same or different, and represent a hydrogen atom, ahalogen atom, a substituted or unsubstituted C1-10 alkyl group, asubstituted or unsubstituted C7-20 aralkyl group, a substituted orunsubstituted C6-20 aryl group, a substituted or unsubstituted C1-10alkoxy group, a substituted or unsubstituted C7-20 aralkyloxy group, asubstituted or unsubstituted C6-20 aryloxy group, or an amino groupdisubstituted with C1-20 hydrocarbon, and n¹ is an integer of 0 to 3.

In the transition metal complex of formula (2), examples of the halogenatom in R¹ to R⁸ include a fluorine atom, a chlorine atom, a bromineatom, and an iodine atom, and preferred is a chlorine atom.

Examples of the unsubstituted C1-10 alkyl group in R¹ to R⁸ include amethyl group, an ethyl group, a n-propyl group, an isopropyl group, an-butyl group, a sec-butyl group, a tert-butyl group, a n-pentyl group,a neopentyl group, an amyl group, a n-hexyl group, a n-octyl group, an-nonyl group, and a n-decyl group, and an C1-10 alkyl group substitutedwith a substituent selected from the group consisting of a halogen atom(preferably a fluorine atom, or a chlorine atom etc.), an alkoxy group(e.g. a methoxy group, an ethoxy group etc.), an aryloxy group (e.g. aphenoxy group etc.), an amino group substituted with hydrocarbon (e.g. adimethylamino group etc.) and a silyl group substituted with hydrocarbon(e.g. a trimethylsilyl group etc.), and specific examples thereofinclude a fluoromethyl group, a difluoromethyl group, a trifluoromethylgroup, a fluoroethyl group, a difluoroethyl group, a trifluoroethylgroup, a tetrafluoroethyl group, a pentafluoroethyl group, aperfluoropropyl group, a perfluorobutyl group, a perfluoropentyl group,a perfluorohexyl group, a perfluorooctyl group, a perfluorodecyl group,a trichloromethyl group, a methoxymethyl group, a phenoxymethyl group, adimethylaminomethyl group, and a trimethylsilylmethyl group. Among them,a methyl group, an ethyl group, an isopropyl group, a tert-butyl groupand an amyl group are preferred, and a tert-butyl group is morepreferred.

In R¹ to R⁸, examples of the unsubstituted C1-10 alkoxy group include amethoxy group, a n-ethoxy group, a n-propoxy group, an isopropoxy group,a n-butoxy group, a sec-butoxy group, a tert-butoxy group, a n-pentyloxygroup, a neopentyloxy group, a n-hexyloxy group, a n-octyloxy group, an-nonyloxy group, and n-decyloxy group. Examples of the substitutedC1-10 alkoxy group include an C1-10 alkoxy group substituted with ahalogen atom (e.g. a fluorine atom or a chlorine atom etc.), an alkoxygroup (e.g. a methoxy group, an ethoxy group etc.), an aryloxy group(e.g. a phenoxy group etc.), an amino group substituted with hydrocarbon(e.g. a dimethylamino group etc.), or a silyl group substituted withhydrocarbon (e.g. a trimethylsilyl group etc.).

Examples of the substituted alkoxy group include a fluoromethoxy group,a difluoromethoxy group, a trifluoromethoxy group, a fluoroethoxy group,a difluoroethoxy group, a trifluoroethoxy group, a tetrafluoroethoxygroup, a pentafluoroexhoxy group, a perfluoropropoxy group, aperfluorobutyloxy group, a perfluoropentyloxy group, a perfluorohexyloxygroup, a perfluorooctyloxy group, a perfluorodecyloxy group, atrichloromethoxy group, a methoxymethoxy group, a phenoxymethoxy group,a dimethylaminomethoxy group, and a trimethylsilylmethoxy group.Preferred alkoxy groups are a methoxy group, an ethoxy group, and atert-butoxy group.

In R¹ to R⁸, examples of the hydrocarbon group of the silyl groupsubstituted with unsubstituted C1-20 hydrocarbon include an C1-10 alkylgroup such as a methyl group, an ethyl group, an-propyl group, anisopropyl group, an-butyl group, a sec-butyl group, a tert-butyl group,a n-pentyl group, a neopentyl group, an amyl group, a n-hexyl group, acyclohexyl group, a n-octyl group, or a n-decyl group, and an C6-20 arylgroup such as a phenyl group, a tolyl group, a xylyl group, a naphthylgroup, or an anthracenyl group.

Examples of the silyl group substituted with the C1-20 hydrocarboninclude a monosubstituted silyl group such as a methylsilyl group, anethylsilyl group, or a phenylsilyl group, a disubstitued silyl groupsuch as a dimethylsilyl group, a diethylsilyl group, or a diphenylsilylgroup, and a trisubstituted silyl group such as a trimethylsilyl group,a triethylsilyl group, a tri-n-propylsilyl group, a tri-isopropylsilylgroup, a tri-n-butylsilyl group, a tri-sec-butylsilyl group, atri-tert-butylsilyl group, a tri-isobutylsilyl group, atert-butyldimethylsilyl group, a tri-n-pentylsilyl group, atri-n-hexylsilyl group, a tricyclohexylsilyl group, or a triphenylsilylgroup, preferred is a trimethylsilyl group, a tert-butyldimethylsilylgroup, or a triphenylmethyl group. Examples of the substitutedhydrocarbon group of the silyl group substituted with substituted C1-20hydrocarbon include such groups wherein the hydrocarbon group issubstituted with a halogen atom, for example, a fluorine atom.

Y of the compound of formula (1), (2) or (3) represents a substituted orunsubstituted C1-10 alkyl group, a substituted or unsubstituted C7-20aralkyl group, a substituted or unsubstituted C6-20 aryl group, or asilyl group substituted with substituted or unsubstituted C1-20hydrocarbon.

In Y, examples of the unsubstituted C1-10 alkyl group include a methylgroup, an ethyl group, a n-propyl group, an isopropyl group, an-butylgroup, a sec-butyl group, a tert-butyl group, a n-pentyl group, aneopentyl group, an amyl group, a n-hexyl group, a n-octyl group, or an-decyl group, examples of the substituted C1-10 alkyl group include anC1-10 alkyl group substituted with an alkoxy group (e.g. a methoxy groupetc.), or aryloxy group (e.g. a phenoxy group), and specific examplesthereof include a methoxymethyl group, and a phenoxymethyl group. Amongthem, a methyl group, an ethyl group, an isopropyl group, and atert-butyl group are preferred, and a tert-butyl group is morepreferred.

In Y, examples of the unsubstituted C7-20 aralkyl group include a benzylgroup, a naphthylmethyl group, an anthracenylmethyl group, adiphenylmethyl group, a (2-methylphenyl)methyl group, a(3-methylphenyl)methyl group, a (4-methylphenyl)methyl group, a(2,3-dimethylphenyl)methyl group, a (2,4-dimethylphenyl)methyl group, a(2,5-dimethylphenyl)methyl group, a (2,6-dimethylphenyl)methyl group, a(3,4-dimethylphenyl)methyl group,

a (2,3,4-trimethylphenyl)methyl group, a (2,3,5-trimethylphenyl)methylgroup, a (2,3,6-trimethylphenyl)methyl group, a(3,4,5-trimethylphenyl)methyl group, a (2,4,6-trimethylphenyl)methylgroup, a (2,3,4,5-tetramethylphenyl)methyl group, a(2,3,4,6-tetramethylphenyl)methyl group, a(2,3,5,6-tetramethylphenyl)methyl group, a (pentamethylphenyl)methylgroup, an (ethylphenyl)methyl group,

a (n-propylphenyl)methyl group, an (isopropylphenyl)methyl group, a(n-butylphenyl)methyl group, a (sec-butylphenyl)methyl group, a(tert-butylphenyl)methyl group, a (n-pentylphenyl)methyl group, a(neopentylphenyl)methyl group, a (n-hexylphenyl)methyl group, a(n-octylphenyl)methyl group, a (n-decylphenyl)methyl group, and a(n-dodecylphenyl)methyl group, and examples of the substituted C7-20aralkyl group include an C7-20 aralkyl group substituted with a groupselected from an alkoxy group (e.g. a methoxy group etc.) and an aryloxygroup (e. g. a phenoxy group etc.), and specific examples thereofinclude a (methoxyphenyl)methyl group, and a (phenoxyphenyl)methylgroup. Preferred aralkyl group is a benzyl group.

In Y, examples of the unsubstituted C6-20 aryl group include a phenylgroup, a naphthyl group, an anthracenyl group, a 2-tolyl group, a3-tolyl group, a 4-tolyl group, a 2,3-xylyl group, a 2,4-xylyl group, a2,5-xylyl group, a 2,6-xylyl group, a 3,4-xylyl group, a 3,5-xylylgroup, a 2,3,4-trimethylphenyl group, a 2,3,5-trimethylphenyl group, a2,3,6-trimethylphenyl group, a 2,4,6-trimethylphenyl group, a3,4,5-trimethylphenyl group, a 2,3,4,5-tetramethylphenyl group, a2,3,4,6-tetramethylphenyl group, a 2,3,5,6-tetramethylphenyl group, apentamethylphenyl group, an ethylphenyl group, a n-propylphenyl group,an isopropylphenyl group, a n-butylphenyl group, a sec-butylphenylgroup, a tert-butylphenyl group, a n-pentylphenyl group, aneopentylphenyl group, a n-hexylphenyl group, a n-octylphenyl group, an-decylphenyl group, a n-dodecylphenyl group, and a n-tetradecylphenylgroup. Examples of the substituted C6-20 aryl group include an C6-20aryl group substituted with an alkoxy group (e.g. a methoxy group etc.)or an aryloxy group (e.g. a phenoxy group etc.), and specific examplesthereof include a 2-methoxyphenyl group, a 3-methoxyphenyl group, a4-methoxyphenyl group, and a 4-phenoxyphenyl group. Preferred aryl groupis a phenyl group.

Examples of the hydrocarbon group of the silyl group substituted with aunsubstituted C1-20 hydrocarbon represented by Y include an C1-10 alkylgroup such as a methyl group, an ethyl group, an-propyl group, aisopropyl group, an-butyl group, a sec-butyl group, a tert-butyl group,a n-pentyl group, a neopentyl group, an amyl group, a n-hexyl group, acyclohexyl group, a n-octyl group, or a n-decyl group, and an C6-20 arylgroup such as a phenyl group, a tolyl group, a xylyl group, a naphthylgroup, or an anthracenyl group. Examples of the silyl group substitutedwith the C1-20 hydrocarbon include a monosubstituted silyl group such asa methylsilyl group, an ethylsilyl group, or a phenylsilyl group, adisubstituted silyl group such as a dimethylsilyl group, a diethylsilylgroup, or a diphenylsilyl group, and a trisubstituted silyl group suchas a trimethylsilyl group, a triethylsilyl group, a tri-n-propylsilylgroup, a tri-isopropylsilyl group, a tri-n-butylsilyl group, atri-sec-butylsilyl group, a tri-tert-butylsilyl group, atri-isobutylsilyl group, a tert-butyldimethyl silyl group, atri-n-pentylsilyl group, a tri-n-hexylsilyl group, a tricyclohexylsilylgroup, or a triphenylsilyl group, examples of the hydrocarbon group ofthe silyl group substituted with substituted C1-20 hydrocarbon include aC1-20 hydrocarbon group substituted with a substituent selected from analkoxy group or an aryloxy group, and preferred are a trimethylsilylgroup, a tert-butyldimethylsilyl group, and a triphenylsilyl group.

M of the compound of formula (1), (2) or (4) represents an element ofGroup 6 of Periodic Table of Elements, specifically, a chromium atom, amolybdenum atom, and a tungsten atom, preferred is a chromium atom.

Examples of the unsubstituted C1-10 alkyl group represented by X¹, X²,X³, X⁴ and X⁵ in the compound of formula (1), (2) or (4) include amethyl group, an ethyl group, an-propyl group, an isopropyl group, an-butyl group, a sec-butyl group, a tert-butyl group, a n-pentyl group,a neopentyl group, an amyl group, a n-hexyl group, a n-octyl group, anda n-decyl group. Examples of the substituted C1-10 alkyl group includean C1-10 alkyl group substituted with a substituent selected from thegroup consisting of a halogen atom (e.g. a fluorine atom or a chlorineatom etc.), an alkoxyl group (e.g. a methoxy group etc.), an aryloxygroup (e.g. a phenoxy group etc.), an amino group substituted withhydrocarbon (e.g. a dimethylamino group etc.), and a silyl groupsubstituted with hydrocarbon (e.g. a trimethylsilyl group etc.), andspecific examples thereof include a fluoromethyl group, a difluoromethylgroup, a trifluoromethyl group, a fluoroethyl group, a difluoroethylgroup, a trifluoroethyl group, a tetrafluoroethyl group, apentafluoroethyl group, a perfluoropropyl group, a perfluorobutyl group,a perfluoropentyl group, a perfluoroethyl group, a perfluorooctyl group,a perfluorodecyl group, a trichloromethyl group, a methoxymethyl group,a phenoxymethyl group, a dimethylaminomethyl group, and atrimethylsilylmethyl group. Among them, preferred are a methyl group,anethyl group, an isopropyl group, a tert-butyl group, and an amyl group,and more preferred is a methyl group.

Examples of the unsubstituted C7-20 aralkyl group in X¹ to X⁵ in thecompound of the formula (1), (2) or (4) include a benzyl group, anaphthylmethyl group, an anthracenylmethyl group, a diphenylmethylgroup, a (2-methylphenyl)methyl group, a (3-methylphenyl)methyl group, a(4-methylphenyl)methyl group, a (2,3-dimethylphenyl)methyl group, a(2,4-dimethylphenyl)methyl group, a (2,5-dimethylphenyl)methyl group, a(2,6-dimethylphenyl)methyl group, a (3,4-dimethylphenyl)methyl group,

a (2,3,4-trimethylphenyl)methyl group, a (2,3,5-trimethylphenyl)methylgroup, a (2,3,6-trimethylphenyl)methyl group, a(3,4,5-trimethtylphenyl)methyl group, a (2,4,6-trimethylphenyl)methylgroup, a (2,3,4,5-tetramethylphenyl)methyl group, a(2,3,4,6-tetramethylphenyl)methyl group, a(2,3,5,6-tetramethylphenyl)methyl group, a (pentamethylphenyl)methylgroup, an (ethylphenyl)methyl group,

a (n-propylphenyl)methyl group, an (isopropylpentyl)methyl group, a(n-butylphenyl)methyl group, a (sec-butylphenyl)methyl group, a(tert-butylheptyl)methyl group, a (n-pentylphenyl)methyl group, a(neopentylphenyl)methyl group, a (n-hexylphenyl)methyl group, a(n-octylphenyl)methyl group, a (n-decylphenyl)methyl group, and a(n-dodecylphenyl)methyl group. Examples of the substituted C7-20 aralkylgroup include an C7-20 aralkyl group substituted with a halogen atom(e.g. a fluorine atom or a chlorine atom etc.), an alkoxy group (e.g. amethoxy group etc.), an aryloxy group (e.g. a phenoxy group etc.), anamino group substituted with hydrocarbon (e.g. a dimethylamino groupetc.), or a silyl group substituted with hydrocarbon (e.g. atrimethylsilyl group etc.), and specific examples thereof include a(fluorophenyl)methyl group, a (difluorophenyl)methyl group, a(pentafluorophenyl)methyl group, a (chlorophenyl)methyl group, a(methoxyphenyl)methyl group, a (phenoxyphenyl)methyl group, a(dimethylaminophenyl)methyl group, and a (trimethylsilylphenyl)methylgroup. Preferred aralkyl group is a benzyl group.

Examples of the unsubstituted C6-20 aryl group in X¹ to X⁵ in thecompound of formula (1), (2) or (4) include a phenyl group, a naphthylgroup, an anthracenyl group, a 2-tolyl group, a 3-tolyl group, a 4-tolylgroup, a 2,3-xylyl group, a 2,4-xylyl group, a 2,5-xylyl group, a2,6-xylyl group, a 3,4-xylyl group, a 3,5-xylyl group, a2,3,4-trimethylphenyl group, a 2,3,5-trimethylphenyl group, a2,3,6-trimethylphenyl group, a 2,4,6-trimethylphenyl group, a3,4,5-trimethylphenyl group, a 2,3,4,5-tetramethylphenyl group, a2,3,4,6-tetramethylphenyl group, a 2,3,5,6-tetramethylphenyl group, apentamethylphenyl group, an ethylphenyl group, a n-propylphenyl group,an isopropylphenyl group, a n-butylphenyl group, a sec-butylphenylgroup, a tert-butylphenyl group, a n-pentylphenyl group, aneopentylphenyl group, a n-hexylphenyl group, a n-octylphenyl group, an-decylphenyl group, a n-dodecylphenyl group, and a n-tetradecylphenylgroup. Examples of the substituted C6-20 aryl group include an C6-20aryl group substituted with a substituent selected from the groupconsisting of a halogen atom (e.g. a fluorine atom etc.), an alkoxygroup (e.g. a methoxy group etc.), an aryloxy group (e.g. a phenoxygroup etc.), an amino group substituted with hydrocarbon (e.g. adimethylamino group etc.), and a silyl group substituted withhydrocarbon (e.g. a trimethylsilyl group etc.), and specific examplesthereof include a 2-fluorophenyl group, a 3-fluorophenyl group, a4-fluorophenyl group, a 3,5-difluorophenyl group, a pentafluorophenylgroup, a 4-chlrophenyl group, a 2-methoxyphenyl group, a 3-methoxyphenylgroup, a 4-methoxyphenyl group, a 4-phenoxyphenyl group, a4-dimethylaminophenyl group, and a 4-trimethylsilylphenyl group.Preferred aryl group is a phenyl group.

Examples of the unsubstituted C1-10 alkoxyl group in X¹ to X⁵ in thecompound of formula (1), (2) or (4) include a methoxy group, an ethoxygroup, a n-propoxy group, an isopropoxy group, a n-butoxy group, asec-butoxy group, a tert-butoxy group, a n-pentyloxy group, aneopentyloxy group, a n-hexyloxy group, a n-octyloxy group, a n-nonyloxygroup, and a n-decyloxy group. Examples of the substituted C1-10 alkoxylgroup include an alkoxyl group substituted with a substituent selectedfrom the group consisting of a halogen atom (e.g. a fluorine atom or achlorine atom etc.), an alkoxy group (e.g. a methoxy group etc.), anaryloxy group (e.g. a phenoxy group etc.), an amino group substitutedwith hydrocarbon (e.g. a dimethylamino group etc.), and a silyl groupsubstituted with hydrocarbon (e.g. a trimethylsilyl group etc.), andspecific examples thereof include a fluoromethoxy group, adifluoromethoxy group, a trifluoromethoxy group, a fluoroethoxy group, adifluoroethoxy group, a trifluoroethoxy group, a tetrafluoroethoxygroup, a pentafluoroethoxy group, a perfluoropropoxy group, aperfluorobutyloxy group, a perfluoropentyloxy group, a perfluorohexyloxygroup, a perfluorooctyloxy group, a perfluorodecyloxy group, atrichloromethoxy group, a methoxymethoxy group, a phenoxymethoxy group,a dimethylaminomethoxy group, and a trimethylsilylmethoxy group.Preferred substituted or unsubstituted C1-10 alkoxyl group are a methoxygroup, an ethoxy group, and a tert-butoxy group.

Examples of the unsubstituted C7-20 aralkyloxy group in X¹ to X⁵ in thecompound of formula (1), (2) or (4) include a benzyloxy group, anaphtylmethoxy group, an anthracenylmethoxy group, a diphenylmethoxygroup, a (2 -methylphenyl)methoxy group, a (3-methyophenyl)methoxygroup, a (4-methylphenyl)methoxy group, a (2,3-dimethylphenyl)methoxygroup, a (2,4-dimethylpehnyl)methoxy group, a(2,5-dimethylphenyl)methoxy group, a (2,6-dimethylphenyl)methoxy group,a (3,4-dimethylphenyl)methoxy group, a (2,3,4-trimethylphenyl)methoxygroup, a (2,3,5-trimethylphenyl)methoxy group, a(2,3,6-trimethylphenyl)methoxy group, a (3,4,5-trimethylphenyl)methoxygroup, a (2,4,6-trimethylphenyl)methoxy group, a(2,3,4,5-tetramethylphenyl)methoxy group, a(2,3,4,6-tetramethylphenyl)methoxy group, a(2,3,5,6-tetramethylphenyl)methoxy group, a (pentamethylphenyl)methoxygroup, an (ethylphenyl)methoxy group, a (n-propylphenyl)methoxy group,an (isopropylphenyl)methoxy group, a (n-butylphenyl)methoxy group, a(sec-butylphenyl)methoxy group, a (tert-butylphenyl)methoxy group, a(n-pentylphenyl)methoxy group, a (neopentylphenyl)methoxy group, a(n-hexylphenyl)methoxy group, a (n-octylphenyl)methoxy group, a(n-decylphenyl)methoxy group, and a (n-dodecylphenyl)methoxy group.Examples of the substituted C7-20 aralkyloxy group include thearalkyloxy group substituted with a substituent selected from the groupconsisting of a halogen atom (e.g. a chlorine atom or a fluorine atometc.), an alkoxy group (e.g. a methoxy group etc.), an aryloxy group(e.g. a phenoxy group etc.), an amino group substituted with hydrocarbon(e.g. a dimethylamino group etc.) and a silyl group substituted withhydrocarbon (e.g. a trimethylsilyl group etc.), and specific examplesthereof include a (fluorophenyl)methyl group, a (difluorophenyl) methylgroup, a (pentafluorophenyl)methyl group, a (chlorophenyl)methyl group,a (methoxyphenyl)methyl group, a (phenoxyphenyl)methyl group, a(dimethylaminophenyl)methyl group, and a (trimethylsilylphenyl)methylgroup. Preferred aralkyloxy group is a benzyloxy group.

Examples of the unsubstituted C6-20 aryloxy group in X¹ to X⁵ in thecompound of formula (1), (2) or (4) include a phenoxy group, a naphthoxygroup, an anthracenoxy group, a 2-methylphenoxy group, a 3-methylphenoxygroup, a 4-methylphenoxy group, a 2,3-dimethylphenoxy group, a2,4-dimethylphenoxy group, a 2,5-dimethylphenoxy group, a2,6-dimethylphenoxy group, a 3,4-dimethylphenoxy group, a3,5-dimethylphenoxy group, a 2,3,4-trimethylphenoxy group, a2,3,5-trimethylphenoxy group, a 2,3,6-trimethylphenoxy group, a2,4,5-trimethylphenoxy group, a 2,4,6-trimethylphenoxy group, a3,4,5-trimethylphenoxy group, a 2,3,4,5-tetramethylphenoxy group, a2,3,4,6-tetramethylphenoxy group, a 2,3,5,6-tetramethylphenoxy group, apentamethylphenoxy group, an ethylphenoxy group, a n-propylphenoxygroup, an isopropylphenoxy group, a n-butylphenoxy group, asec-butylphenoxy group, a tert-butylphenoxy group, a n-hexylphenoxygroup, a n-octylphenoxy group, a n-decylphenoxy group, and an-tetradecylphenoxy group. Examples of the substituted C6-20 aryloxygroup include an aryloxy group substituted with a substituent selectedfrom the group consisting of a halogen atom (e.g. a chlorine atom or afluorine atom etc.), an alkoxy group (e.g. a methoxy group etc.), anaryloxy group (a phenoxy group etc.), an amino group substituted withhydrocarbon (e. g. a dimethylamino group etc.), and a silyl groupsubstituted with hydrocarbon (e.g. a trimethylsilyl group etc.), andspecific examples thereof include a 2-fluorophenoxy group, a3-fluorophenoxy group, a 4-fluorophenoxy group, a 3,5-difluorophenoxygroup, a pentafluorophenoxy group, a 4-chlorophenoxy group, a2-methoxyphenoxy group, a 3-methoxyphenoxy group, a 4-methoxyphenoxygroup, a 4-phenoxyphenoxy group, a 4-dimethylaminophenoxy group, and a4-trimethylsilylphenoxy group. Preferred substituted or unsubstitutedC7-20 aryloxy group is a phenoxy group.

Examples of the hydrocarbon group in an amino group disubstituted withC1-20 hydrocarbon in X¹ to X⁵ in the compound of formula (1), (2) or (4)include an C1-10 alkyl group such as a methyl group, an ethyl group, an-propyl group, an isopropyl group, a n-butyl group, a sec-butyl group,a tert-butyl group, a n-pentyl group, a neopentyl group, an amyl group,a n-hexyl group, a cyclohexyl group, a n-octyl group, or a n-decylgroup, and an C6-20 aryl group such as a phenyl group, a tolyl group axylyl group, a naphthyl group, or an anthracenyl group. Examples of theamino group substituted with C1-20 hydrocarbon include a dimethylaminogroup, a diethylamino group, a di-n-propylamino group, adiisopropylamino group, a di-n-butylamino group, a di-sec-butylaminogroup, a di-tert-butylamino group, a di-isobutylamino group, atert-butylisopropylamino group, a di-n-hexylamino group, adi-n-octylamino group, a di-n-decylamino group, and a diphenylaminogroup, and preferred is a dimethylamino group, or a diethylamino group.

Examples of the halogen atom in X¹ to X⁵ in the compound of formula (1),(2) or (4) include a fluorine atom, a chlorine atom, a bromine atom, andan iodine atom, and preferred is a chlorine atom.

Examples of the neutral ligand represented by L₀ include a moleculehaving a neutral functional group such as ether, sulfide, amine,phosphine and olefin, and a neutral ligand may have a plurality ofcoordinating functional groups in its molecule.

Examples of the neutral ligand include dimethyl ether, diethyl ether,methyl tert-butyl ether, furan, tetrahydrofuran, dimethoxyethane,diethoxyethane, dimethyl sulfide, diethyl sulfide, methyl tert-butylsulfide, thiophene, tetrahydrothiophene, ethylenedithiol dimethylsulfide, ethylenedithiol diethyl sulfide, trimethylamine, triethylamine,triphenylamine, tricyclohexylamine, pyridine, 2,2′-bipyridine,tetramethylethylenediamine, tetraethylethylenediamine,triphenylphosphine, tricyclohexylphosphine, tri-tert-butylphosphine,bis(diphenylphosphino)methane, bis(diphenylphosphino)ethane,bis(diphenylphosphino)propane, bis(diphenylphosphino)binaphthyl,ethylene, propylene, butene, butadiene, octene, octadiene, cyclohexene,cyclohexadiene, norbornene, and norbornadiene.

Examples of the transition metal complex of formula (1) include2,2′-(phenylphosphido)bisphenoxychromium chloride,2,2′-(phenylphosphido)bis(4-methylphenoxy)chromium chloride,2,2′-(phenylphosphido)bis(4,6-dimethylphenoxy)chromium chloride,2,2′-(phenylphosphido)bis(4-tert-butyl-6-methylphenoxy)chromiumchloride,2,2′-(phenylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromiumchloride, 2,2′-(phenylphosphido)bis(4,6-di-tert-butylphenoxy)chromiumchloride, 2,2′-(phenylphosphido)bis(4-methoxyphenoxy)chromium chloride,2,2′-(phenylphosphido)bis(6-bromophenoxy)chromium chloride,2,2′-(phenylphosphido)bis(6-trimethylsilylphenoxy)chromium chloride,

2,2′-(methylphosphido)bisphenoxychromium chloride,2,2′-(methylphosphido)bis(4-methylphenoxy)chromium chloride,2,2′-(methylphosphido)bis(4,6-dimethylphenoxy)chromium chloride,2,2′-(methylphosphido)bis(4-tert-butyl-6-methylphenoxy)chromiumchloride,2,2′-(methylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromiumchloride, 2,2′-(methylphosphido)bis(4,6-di-tert-butylphenoxy)chromiumchloride, 2,2′-(methylphosphido)bis(4-methoxyphenoxy)chromium chloride,2,2′-(methylphosphido)bis(6-bromophenoxy)chromium chloride,2,2′-(methylphosphido)bis(6-trimethylsilylphenoxy)chromium chloride,

2,2′-(tert-butylphosphido)bisphenoxychromium chloride,2,2′-(tert-butylphosphido)bis(4-methylphenoxy)chromium chloride,2,2′-(tert-butylphosphido)bis(4,6-dimethylphenoxy)chromium chloride,2,2′-(tert-butylphosphido)bis(4-tert-butyl-6-methylphenoxy)-chromiumchloride,2,2′-(tert-butylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromiumchloride,2,2′-(tert-butylphosphido)bis(4,6-di-tert-butylphenoxy)-chromiumchloride, 2,2′-(tert-butylphosphido)bis(4-methoxyphenoxy)chromiumchloride, 2,2′-(tert-butylphosphido)bis(6-bromophenoxy)chromiumchloride, 2,2′-(tert-butylphosphido)bis(6-trimethylsilylphenoxy)chromiumchloride,

2,2′-(cyclohexylphosphido)bisphenoxychromium chloride,2,2′-(cyclohexylphosphido)bis(4-methylphenoxy)chromium chloride,2,2′-(cyclohexylphosphido)bis(4,6-dimethylphenoxy)chromium chloride,2,2′-(cyclohexylphosphido)bis(4-tert-butyl-6-methylphenoxy)chromiumchloride,2,2′-(cyclohexylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromiumchloride,2,2′-(cyclohexylphosphido)bis(4,6-di-tert-butylphenoxy)chromiumchloride, 2,2′-(cyclohexylphosphido)bis(4-methoxyphenoxy)chromiumchloride, 2,2′-(cyclohexylphosphido)bis(6-bromophenoxy)chromiumchloride,2,2′-(cyclohexylphosphido)bis(6-trimethylsilylphenoxy)-chromiumchloride,

2,2′-(benzylphosphido)bisphenoxychromium chloride,2,2′-(benzylphosphido)bis(4-methylphenoxy)chromium chloride,2,2′-(benzylphosphido)bis(4,6-dimethylphenoxy)chromium chloride,2,2′-(benzylphosphido)bis(4-tert-butyl-6-methylphenoxy)chromiumchloride,2,2′-(benzylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromiumchloride, 2,2′-(benzylphosphido)bis(4,6-di-tert-butylphenoxy)chromiumchloride, 2,2′-(benzylphosphido)bis(4-methoxyphenoxy)chromium chloride,2,2′-(benzylphosphido)bis(6-bromophenoxy)chromium chloride,2,2′-(benzylphosphido)bis(6-trimethylsilylphenoxy)chromium chloride,

2,2′-(trimethylsilylphosphido)bisphenoxychromium chloride,2,2′-(trimethylsilylphosphido)bis(4-methylphenoxy)chromium chloride,2,2′-(trimethylsilylphosphido)bis(4,6-dimethylphenoxy)-chromiumchloride,2,2′-(trimethylsilylphosphido)bis(4-tert-butyl-6-methyl-phenoxy)chromiumchloride,2,2′-(trimethylsilylphosphido)bis(6-tert-butyl-4-methyl-phenoxy)chromiumchloride,2,2′-(trimethylsilylphosphido)bis(4,6-di-tert-butylphenoxy)chromiumchloride, 2,2′-(trimethylsilylphosphido)bis(4-methoxyphenoxy)chromiumchloride, 2,2′-(trimethylsilylphosphido)bis(6-bromophenoxy)chromiumchloride, and2,2′-(trimethylsilylphosphido)bis(6-trimethylsilylphenoxy)chromiumchloride, and compounds in which the chromium is replaced by molybdenumor tungsten, and compounds in which chloride is replaced by bromide,iodide, methoxide, isopropoxide, butoxide, dimethylamide, ethylamide,methyl, or trimethylsilylmethyl.

The compound of formula (3) can be prepared according to the methoddescribed in JP-A No. 9-104691.

Examples of the compound of formula (3) include:bis(hydroxymethyl)methylphosphine, bis(hydroxymethyl)isopropylphosphine,bis(hydroxymethyl)ethylphosphine, bis(hydroxymethyl)-n-propylphosphine,bis(hydroxymethyl)-n-butylphosphine,bis(hydroxymethyl)-t-butylphosphine, bis(hydroxymethyl)benzylphosphine,bis(hydroxymethyl)phenylphosphine, bis(hydroxymethyl)mesitylphosphine,bis(hydroxymethyl)(3-chrorophenyl)phosphine,bis(hydroxymethyl)(trimethylsilyl)phosphine,bis(hydroxymethyl)(diphenylmethylsilyl)phosphine,bis(hydroxymethyl)(dimethylphenylsilyl)phosphine,

bis(2-hydroxyethyl)methylphosphine,bis(2-hydroxyethyl)isopropylphosphine,bis(2-hydroxyethyl)ethylphosphine,bis(2-hydroxyethyl)-n-propylphosphine,bis(2-hydroxyethyl)-n-butylphosphine,bis(2-hydroxyethyl)-t-butylphosphine,bis(2-hydroxyethyl)benzylphosphine, bis(2-hydroxyethyl)phenylphosphine,bis(2-hydroxyethyl)mesitylphosphine,bis(2-hydroxyethyl)(3-chlorophenyl)phosphine,bis(2-hydroxyethyl)(trimethylsilyl)phosphine,bis(2-hydroxyethyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxyethyl)(dimethylphenylsilyl)phosphine,

bis(3-hydroxypropyl)methylphosphine,bis(3-hydroxypropyl)isopropylphosphine,bis(3-hydroxypropyl)ethylphosphine,bis(3-hydroxypropyl)-n-propylphosphine,bis(3-hydroxypropyl)-n-butylphosphine,bis(3-hydroxypropyl)-tert-butylphosphine,bis(3-hydroxypropyl)benzylphosphine,bis(3-hydroxypropyl)phenylphosphine,bis(3-hydroxypropyl)mesitylphosphine,bis(3-hydroxypropyl)(3-chlorophenyl)phosphine,bis(3-hydroxypropyl)(trimethylsilyl)phosphine,bis(3-hydroxypropyl)(diphenylmethylsilyl)phosphine,bis(3-hydroxypropyl)(dimethylphenylsilyl)phosphine,

bis(1-hydroxyethyl)methylphosphine,bis(1-hydroxyethyl)isopropylphosphine,bis(1-hydroxyethyl)ethylphosphine,bis(1-hydroxyethyl)-n-propylphosphine,bis(1-hydroxyethyl)-n-butylphosphine,bis(1-hydroxyethyl)-tert-butylphosphine,bis(1-hydroxyethyl)benzylphosphine, bis(1-hydroxyethyl)phenylphosphine,bis(1-hydroxyethyl)mesitylphosphine,bis(1-hydroxyethyl)(3-chlorophenyl)phosphine,bis(1-hydroxyethyl)(trimethylsilyl)phosphine,bis(1-hydroxyethyl)(diphenylmethylsilyl)phosphine,bis(1-hydroxyethyl)(dimethylphenylsilyl)phosphine,

bis(2-hydroxyethylenyl)methylphosphine,bis(2-hydroxyethylenyl)isopropylphosphine,bis(2-hydroxyethylenyl)ethylphosphine,bis(2-hydroxyethylenyl)-n-propylphosphine,bis(2-hydroxyethylenyl)-n-butylphosphine,bis(2-hydroxyethylenyl)-tert-butylphosphine,bis(2-hydroxyethylenyl)benzylphosphine,bis(2-hydroxyethylenyl)phenylphosphine,bis(2-hydroxyethylenyl)mesitylphosphine,bis(2-hydroxyethylenyl)(3-chlorophenyl)phosphine,bis(2-hydroxyethylenyl)(trimethylsilyl)phosphine,bis(2-hydroxyethylenyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxyethylenyl)(dimethylphenylsilyl)phosphine,

bis(3-hydroxypropenyl)methylphosphine,bis(3-hydroxypropenyl)isopropylphosphine,bis(3-hydroxypropenyl)ethylphosphine,bis(3-hydroxypropenyl)-n-propylphosphine,bis(3-hydroxypropenyl)-n-butylphosphine,bis(3-hydroxypropenyl)-tert-butylphosphine,bis(3-hydroxypropenyl)benzylphosphine,bis(3-hydroxypropenyl)phenylphosphine,bis(3-hydroxypropenyl)mesitylphosphine,bis(3-hydroxypropenyl)(3-chlorophenyl)phosphine,bis(3-hydroxypropenyl)(trimethylsilyl)phosphine,bis(3-hydroxypropenyl)(diphenylmethylsilyl)phosphine,bis(3-hydroxypropenyl)(dimethylphenylsilyl)phosphine,

bis(2-hydroxyphenyl)methylphosphine,bis(2-hydroxyphenyl)isopropylphosphine,bis(2-hydroxyphenyl)ethylphosphine,bis(2-hydroxyphenyl)-n-propylphosphine,bis(2-hydroxyphenyl)-n-butylphosphine,bis(2-hydroxyphenyl)-tert-butylphosphine,bis(2-hydroxyphenyl)benzylphosphine,bis(2-hydroxyphenyl)phenylphosphine,bis(2-hydroxyphenyl)mesitylphosphine,bis(2-hydroxyphenyl)-(3-chlorophenyl)phosphine,bis(2-hydroxyphenyl)-(trimethylsilyl)phosphine,bis(2-hydroxyphenyl)-(diphenylmethylsilyl)phosphine,bis(2-hydroxyphenyl)-(dimethylphenylsilyl)phosphine,

bis(2-hydroxy-3-methylphenyl)methylphosphine,bis(2-hydroxy-3-methylphenyl)isopropylphosphine,bis(2-hydroxy-3-methylphenyl)ethylphosphine,bis(2-hydroxy-3-methylphenyl)-n-propylphosphine,bis(2-hydroxy-3-methylphenyl)-n-butylphosphine,bis(2-hydroxy-3-methylphenyl)-tert-butylphosphine,bis(2-hydroxy-3-methylphenyl)benzylphosphine,bis(2-hydroxy-3-methylphenyl)phenylphosphine,bis(2-hydroxy-3-methylphenyl)mesitylphosphine,bis(2-hydroxy-3-methylphenyl)(3-chlorophenyl)phosphine,bis(2-hydroxy-3-methylphenyl)(trimethylsilyl)phosphine,bis(2-hydroxy-3-methylphenyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxy-3-methylphenyl)(dimethylphenylsilyl)phosphine

bis(2-hydroxy-5-methylphenyl)methylphosphine,bis(2-hydroxy-5-methylphenyl)isopropylphosphine,bis(2-hydroxy-5-methylphenyl)ethylphosphine,bis(2-hydroxy-5-methylphenyl)-n-propylphosphine,bis(2-hydroxy-5-methylphenyl)-n-butylphosphine,bis(2-hydroxy-5-methylphenyl)-t-butylphosphine,bis(2-hydroxy-5-methylphenyl)benzylphosphine,bis(2-hydroxy-5-methylphenyl)phenylphosphine,bis(2-hydroxy-5-methylphenyl)mesitylphosphine,bis(2-hydroxy-5-methylphenyl)(3-chlorophenyl)phosphine,bis(2-hydroxy-5-methylphenyl)(trimethylsilyl)phosphine,bis(2-hydroxy-5-methylphenyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxy-5-methylphenyl)(dimethylphenylsilyl)phosphine

bis(2-hydroxy-3-tert-butylphenyl)methylphosphine,bis(2-hydroxy-3-t-butylphenyl)isopropylphosphine,bis(2-hydroxy-3-t-butylphenyl)ethylphosphine,bis(2-hydroxy-3-t-butylphenyl)-n-propylphosphine,bis(2-hydroxy-3-t-butylphenyl)-n-butylphosphine,bis(2-hydroxy-3-t-butylphenyl)-t-butylphosphine,bis(2-hydroxy-3-t-butylphenyl)benzylphosphine,bis(2-hydroxy-3-t-butylphenyl)phenylphosphine,bis(2-hydroxy-3-t-butylphenyl)mesitylphosphine,bis(2-hydroxy-3-t-butylphenyl)(3-chlorophenyl)phosphine,bis(2-hydroxy-3-t-butylphenyl)(trimethylsilyl)phosphine,bis(2-hydroxy-3-t-butylphenyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxy-3-t-butylphenyl)(dimethylphenylsilyl)phosphine,

bis(2-hydroxy-5-tert-butylphenyl)methylphosphine,bis(2-hydroxy-5-t-butylphenyl)isopropylphosphine,bis(2-hydroxy-5-tert-butylphenyl)ethylphosphine,bis(2-hydroxy-5-tert-butylphenyl)-n-propylphosphine,bis(2-hydroxy-5-tert-butylphenyl)-n-butylphosphine,bis(2-hydroxy-5-tert-butylphenyl)-tert-butylphosphine,bis(2-hydroxy-5-tert-butylphenyl)benzylphosphine,bis(2-hydroxy-5-tert-butylphenyl)phenylphosphine,bis(2-hydroxy-5-tert-butylphenyl)mesitylphosphine,bis(2-hydroxy-5-tert-butylphenyl)(3-chlorophenyl)phosphine,bis(2-hydroxy-5-tert-butylphenyl)(trimethylsilyl)phosphine,bis(2-hydroxy-5-tert-butylphenyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxy-5-tert-butylphenyl)(dimethylphenylsilyl)phosphine,

bis(2-hydroxy-3-butyl-5-methylphenyl)methylphosphine,bis(2-hydroxy-3-butyl-5-methylphenyl)isopropylphosphine,bis(2-hydroxy-3-butyl-5-methylphenyl)ethylphosphine,bis(2-hydroxy-3-butyl-5-methylphenyl)-n-propylphosphine,bis(2-hydroxy-3-butyl-5-methylphenyl)-n-butylphosphine,bis(2-hydroxy-3-butyl-5-methylphenyl)-tert-butylphosphine,bis(2-hydroxy-3-butyl-5-methylphenyl)benzylphosphine,bis(2-hydroxy-3-butyl-5-methylphenyl)phenylphosphine,bis(2-hydroxy-3-butyl-5-methylphenyl)mesitylphosphine,bis(2-hydroxy-3-butyl-5-methylphenyl)(3-chlorophenyl)phosphine,bis(2-hydroxy-3-butyl-5-methylphenyl)(trimethylsilyl)phosphine,bis(2-hydroxy-3-butyl-5-methylphenyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxy-3-butyl-5-methylphenyl)(dimethylphenylsilyl)-phosphine,

bis(2-hydroxy-5-butyl-3-methylphenyl)methylphosphine,bis(2-hydroxy-5-butyl-3-methylphenyl)isopropylphosphine,bis(2-hydroxy-5-butyl-3-methylphenyl)ethylphosphine,bis(2-hydroxy-5-butyl-3-methylphenyl)-n-propylphosphine,bis(2-hydroxy-5-butyl-3-methylphenyl)-n-butylphosphine,bis(2-hydroxy-5-butyl-3-methylphenyl)-tert-butylphosphine,bis(2-hydroxy-5-butyl-3-methylphenyl)benzylphosphine,bis(2-hydroxy-5-butyl-3-methylphenyl)phenylphosphine,bis(2-hydroxy-5-butyl-3-methylphenyl)mesitylphosphine,bis(2-hydroxy-5-butyl-3-methylphenyl)(3-chlorophenyl)phosphine,bis(2-hydroxy-5-butyl-3-methylphenyl)(trimethylsilyl)phosphine,bis(2-hydroxy-5-butyl-3-methylphenyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxy-5-butyl-3-methylphenyl)(dimethylphenylsilyl)phosphine,

bis(2-hydroxy-3,5-dimethylphenyl)methylphosphine,bis(2-hydroxy-3,5-dimethylphenyl)isopropylphosphine,bis(2-hydroxy-3,5-dimethylphenyl)ethylphosphine,bis(2-hydroxy-3,5-dimethylphenyl)-n-propylphosphine,bis(2-hydroxy-3,5-dimethylphenyl)-n-butylphosphine,bis(2-hydroxy-3,5-dimethylphenyl)-tert-butylphosphine,bis(2-hydroxy-3,5-dimethylphenyl)benzylphosphine,bis(2-hydroxy-3,5-dimethylbenyl)phenylphosphine,bis(2-hydroxy-3,5-dimethylphenyl)mesitylphosphine,bis(2-hydroxy-3,5-dimethylphenyl)(3-chlorophenyl)phosphine,bis(2-hydroxy-3,5-dimethylphenyl)(trimethylsilyl)phosphine,bis(2-hydroxy-3,5-dimethylphenyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxy-3,5-dimethylphenyl)(dimethylphenylsilyl)phosphine,

bis(2-hydroxy-3,5-dibutylphenyl)methylphosphine,bis(2-hydroxy-3,5-dibutylphenyl)isopropylphosphine,bis(2-hydroxy-3,5-dibutylphenyl)ethylphosphine,bis(2-hydroxy-3,5-dibutylphenyl)-n-propylphosphine,bis(2-hydroxy-3,5-dibutylphenyl)-n-butylphosphine,bis(2-hydroxy-3,5-dibutylphenyl)-tert-butylphosphine,bis(2-hydroxy-3,5-dibutylphenyl)benzylphosphine,bis(2-hydroxy-3,5-dibutylphenyl)phenylphosphine,bis(2-hydroxy-3,5-dibutylphenyl)mesitylphosphine,bis(2-hydroxy-3,5-dibutylphenyl)(3-chlorophenyl)phosphine,bis(2-hydroxy-3,5-dibutylphenyl)(trimethylsilyl)phosphine,bis(2-hydroxy-3,5-dibutylphenyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxy-3,5-dibutylphenyl)(dimethylphenylsilyl)phosphine,

bis(2-hydroxy-3-methyl-5-methoxyphenyl)methylphosphine,bis(2-hydroxy-3-methyl-5-methoxyphenyl)isopropylphosphine,bis(2-hydroxy-3-methyl-5-methoxyphenyl)ethylphosphine,bis(2-hydroxy-3-methyl-5-methoxyphenyl)-n-propylphosphine,bis(2-hydroxy-3-methyl-5-methoxyphenyl)-n-butylphosphine,bis(2-hydroxy-3-methyl-5-methoxyphenyl)-tert-butylphosphine,bis(2-hydroxy-3-methyl-5-methoxyphenyl)benzylphosphine,bis(2-hydroxy-3-methyl-5-methoxyphenyl)phenylphosphine,bis(2-hydroxy-3-methyl-5-methoxyphenyl)mesitylphosphine,bis(2-hydroxy-3-methyl-5-methoxyphenyl)(3-chlorophenyl)phosphine,bis(2-hydroxy-3-methyl-5-methoxyphenyl)(trimethylsilyl)phosphine,bis(2-hydroxy-3-methyl-5-methoxyphenyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxy-3-methyl-5-methoxyphenyl)(dimethylphenylsilyl)phosphine,

bis(2-hydroxy-3-trimethylsilylphenyl)methylphosphine,bis(2-hydroxy-3-trimethylsilylphenyl)isopropylphosphine,bis(2-hydroxy-3-trimethylsilylphenyl)ethylphosphine,bis(2-hydroxy-3-trimethylsilylphenyl)-n-propylphosphine,bis(2-hydroxy-3-trimethylsilylphenyl)-n-butylphosphine,bis(2-hydroxy-3-trimethylsilylphenyl)-tert-butylphosphine,bis(2-hydroxy-3-trimethylsilylphenyl)benzylphosphine,bis(2-hydroxy-3-trimethylsilylphenyl)phenylphosphine,bis(2-hydroxy-3-trimethylsilylphenyl)mesitylphosphine,bis(2-hydroxy-3-trimethylsilylphenyl)(3-chlorophenyl)phosphine,bis(2-hydroxy-3-trimethylsilylphenyl)(trimethylsilyl)phosphine,bis(2-hydroxy-3-trimethylsilylphenyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxy-3-trimethylsilylphenyl)(dimethylphenylsilyl)phosphine,

bis(2-hydroxy-3,5-dibromophenyl)methylphosphine,bis(2-hydroxy-3,5-dibromophenyl)isopropylphosphine,bis(2-hydroxy-3,5-dibromophenyl)ethylphosphine,bis(2-hydroxy-3,5-dibromophenyl)-n-propylphosphine,bis(2-hydroxy-3,5-dibromophenyl)-n-butylphosphine,bis(2-hydroxy-3,5-dibromophenyl)-tert-butylphosphine,bis(2-hydroxy-3,5-dibromophenyl)benzylphosphine,bis(2-hydroxy-3,5-dibromophenyl)phenylphosphine,bis(2-hydroxy-3,5-dibromophenyl)mesitylphosphine,bis(2-hydroxy-3,5-dibromophenyl)(3-chlorophenyl)phosphine,bis(2-hydroxy-3,5-dibromophenyl)(trimethylsilyl)phosphine,bis(2-hydroxy-3,5-dibromophenyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxy-3,5-dibromophenyl)(dimethylphenylsilyl)phosphine,

bis(2-hydroxy-1-naphthyl)methylphosphine,bis(2-hydroxy-1-naphthyl)isopropylphosphine,bis(2-hydroxy-1-naphthyl)ethylphosphine,bis(2-hydroxy-1-naphthyl)-n-propylphosphine,bis(2-hydroxy-1-naphthyl)-n-butylphosphine,bis(2-hydroxy-1-naphthyl)-tert-butylphosphine,bis(2-hydroxy-1-naphthyl)benzylphosphine,bis(2-hydroxy-1-naphthyl)phenylphosphine,bis(2-hydroxy-1-naphthyl)mesitylphosphine,bis(2-hydroxy-1-naphthyl)(3-chlorophenyl)phosphine,bis(2-hydroxy-1-naphthyl)(trimethylsilyl)phosphine,bis(2-hydroxy-1-naphthyl)(diphenylmethylsilyl)phosphine,bis(2-hydroxy-1-naphthyl)(dimethylphenylsilyl)phosphine,

bis(1-hydroxy-2-naphthyl)methylphosphine,bis(1-hydroxy-2-naphthyl)isopropylphosphine,bis(1-hydroxy-2-naphthyl)ethylphosphine,bis(1-hydroxy-2-naphthyl)-n-propylphosphine,bis(1-hydroxy-2-naphthyl)-n-butylphosphine,bis(1-hydroxy-2-naphthyl)-tert-butylphosphine,bis(1-hydroxy-2-naphthyl)benzylphosphine,bis(1-hydroxy-2-naphthyl)phenylphosphine,bis(1-hydroxy-2-naphthyl)mesitylphosphine,bis(1-hydroxy-2-naphthyl)(3-chlorophenyl)phosphine,bis(1-hydroxy-2-naphthyl)(trimethylsilyl)phosphine,bis(1-hydroxy-2-naphthyl)(diphenylmethylsilyl)phosphine,bis(1-hydroxy-2-naphthyl)(dimethylphenylsilyl)phosphine,

bis(dimethylsilanol)methylphosphine,bis(dimethylsilanol)isopropylphosphine,bis(dimethylsilanol)ethylphosphine,bis(dimethylsilanol)-n-propylphosphine,bis(dimethylsilanol)-n-butylphosphine,bis(dimethylsilanol)-tert-butylphosphine,bis(dimethylsilanol)benzylphosphine,bis(dimethylsilanol)phenylphosphine,bis(dimethylsilanol)mesitylphosphine,bis(dimethylsilanol)(3-chlorophenyl)phosphine,bis(dimethylsilanol)(trimethylsilyl)phosphine,bis(dimethylsilanol)(diphenylmethylsilyl)phosphine,bis(dimethylsilanol)(dimethylphenylsilyl)phosphine,

bis(methylphenylsilanol)methylphosphine,bis(methylphenylsilanol)isopropylphosphine,bis(methylphenylsilanol)ethylphosphine,bis(methylphenylsilanol)-n-propylphosphine,bis(methylphenylsilanol)-n-butylphosphine,bis(methylphenylsilanol)-tert-butylphosphine,bis(methylphenylsilanol)benzylphosphine,bis(methylphenylsilanol)phenylphosphine,bis(methylphenylsilanol)mesitylphosphine,bis(methylphenylsilanol)(3-chlorophenyl)phosphine,bis(methylphenylsilanol)(trimethylsilyl)phosphine,bis(methylphenylsilanol)(diphenylmethylsilyl)phosphine,bis(methylphenylsilanol)(dimethylphenylsilyl)phosphine,

bis(diphenylsilanol)methylphosphine,bis(diphenylsilanol)isopropylphosphine,bis(diphenylsilanol)ethylphosphine,bis(diphenylsilanol)-n-propylphosphine,bis(diphenylsilanol)-n-butylphosphine,bis(diphenylsilanol)-tert-butylphosphine,bis(diphenylsilanol)benzylphosphine,bis(diphenylsilanol)phenylphosphine,bis(diphenylsilanol)mesitylphosphine,bis(diphenylsilanol)(3-chlorophenyl)phosphine,bis(diphenylsilanol)(trimethylsilyl)phosphine,bis(diphenylsilanol)(diphenylmethylsilyl)phosphine,bis(diphenylsilanol)(dimethylphenylsilyl)phosphine.

In addition, examples of the transition metal compound of formula (4)include trichlorochromium, trichlorochromium-3tetrahydrofuran complex,tris(bis[trimethylsilyl]methyl)chromium, dimesitylchromiumtetrahydrofuran complex, dimesitylchromium 3tetrahydrofuran complex,trimesitylchromium tetrahydrofuran complex, chromium (II)acetylacetonate, bis(trifluoroacetoxy)chromium,tris(trifluoroacetoxy)chromium,

trichloromolybdenum, pentachloromolybdenum, molybdenum acetate,triallylchloromolybdenum, mesitylenetricarbonylmolybdenum,tetracarbonyl[(1,2,5,6)-1,5-cyclooctadiene]molybdenum, tungstentetrachloride, tungsten hexachloride, mesitylene tungsten tricarbonyl,tetrabenzyltungsten, tetramethyltungsten, pentamethyltungsten,benzyltetrachlorotungsten, phenyltrichlorotungsten,trimethylchlorotungsten, and tris(bis[trimethylsilyl]methyl)tungsten.

The transition metal complex of formula (1) can be obtained, forexample, by reacting the compound of formula (3) with the transitionmetal compound of formula (4).

A mol ratio of the compound of formula (3) and the transition metalcompound of formula (4) is not particularly limited, but is preferablyin a range of 1:0.1 to 1:10, more preferably a range of 1:0.5 to 1:2.

Upon a reaction, a base is used, if necessary. Examples of the baseinclude, for example, an organic alkali metal compound such as anorganic lithium compound such as methyllithium, ethyllithium,n-butyllithium, sec-butyllithium, tert-butyllithium,lithiumtrimethylsilylacetylide, lithiumacetylide,trimethylsilylmethyllithium, vinyllithium, phenyllithium andallyllithium, and the amount of the base is usually in a range of 0.5 to5 moles per mol of the compound of formula (3).

The aforementioned reaction is usually performed in a solvent which isinert to a reaction. Examples of such the solvent include an aproticsolvent such as an aromatic hydrocarbon solvent such as benzene andtoluene, an aliphatic hydrocarbon solvent such as hexane and heptane, anether solvent such as diethyl ether, tetrahydrofuran, and 1,4-dioxane,an amide solvent such as hexamethylphosphoric amide, anddimethylformamide, a polar solvent such as acetonitrile, propionitrile,acetone, diethyl ketone, methyl isobutyl ketone, and cyclohexanone, anda halogenated solvent such as dichloromethane, dichloroethane,chlorobenzene, and dichlorobenzene. The solvents are used alone, or maybe used by mixing two or more kinds. The amount of the solvent isusually in a range of 1 to 200 parts by weight, preferably 3 to 50 partsby weight per part by weight of the compound of formula (2).

An order of the aforementioned reaction is not particularly limited, butthe reaction can be usually performed by adding a base to a solvent andthe compound of formula (3), if necessary, and adding the transitionmetal compound of formula (4).

The reaction temperature is usually not lower than −100° C. to a boilingpoint of a solvent, preferably in a range of about −80 to 100° C.

The transition metal complex of formula (1) can be obtained from theresulting reaction mixture by a conventional method, for example, by aprocedure of filtering produced precipitates, and concentrating thefiltrate to precipitate a solid matter.

The transition metal complex of formula (1) obtained by the reaction ofthe compound of formula (3) with the transition metal compound offormula (4) may be used in the polymerization without purifying from areaction solution.

The thus prepared transition metal complex of formula (1) can be used bycharging a compound (A) or further a compound (B) in an optional orderin polymerization, or a reaction product obtained by contacting acombination of those optional compounds before-hand may be used.

[Compound A]

As the compound (A) used in the present invention, the known organicaluminum compound can be used. Preferred compound (A) is any one ofcompounds (A₁) to (A₃), or a mixture of two or more of them.

Examples of the organic aluminum compound (A₁) of formula:(E₁)_(a)Al(Z′)_((3-a)) include trialkylaluminum such astrimethylaluminum, triethylaluminum, tripropylaluminum,triisobutylaluminum, and trihexylaluminum; dialkylaluminum chloride suchas dimethylaluminum chloride, diethylaluminum chloride, dipropylaluminumchloride, diisobutylaluminum chloride, and dihexylaluminum chloride;alkylaluminum dichloride such as methylaluminum dichloride,ethylaluminum dichloride, propylaluminum dichloride, isobutylaluminumdichlofirde, hexylaluminum dichloride; dialkylaluminumhydride such asdimethylaluminum hydride, diethylaluminum hydride, dipropylaluminumhydride, diisobutylaluminum hydride, and dihexylaluminum hydride.Preferred is trialkylaluminum, and more preferred is triethylaluminum,or triisobutylaluminum.

Examples of E₂ or E₃ in cyclic aluminoxane (A₂) having a structure offormula: {—Al(E₂)-O—}_(b) or linear aluminoxane (A₃) having a structureof formula: (E₃){—Al(E₃)-O—}_(c)Al(E₃)₂ include an alkyl group such as amethyl group, an ethyl group, a normal propyl group, an isopropyl group,a normal butyl group, an isobutyl group, a normal pentyl group, and aneopentyl group. And, b is an integer of 2 or more, and c is an integerof 1 or more. Preferred E₂ and E₃ are a methyl group and an isobutylgroup, b is 2 to 40, and c is around 1 to 40.

The aforementioned aluminoxane is prepared by various processes. Theprocess is not particularly limited, but the aluminoxane may be preparedaccording to the known process. For example, the aluminoxane is preparedby contacting water with a solution in which trialkylaluminum (e.g.trimethylaluminum etc.) is dissolved in a suitable organic solvent(benzene, aliphatic hydrocarbon etc.). Alternatively, there can beexemplified a method of preparing the aluminoxane by contactingtrialkylaluminum (e.g. trimethylaluminum) with a metal salt (e.g. coppersulfate hydrate etc.) containing crystal water.

Examples of the compound (B) used in the present invention include anyone of boron compounds represented by (B₁), (B₂) or (B₃), or a mixtureof two or more of them.

In the boron compound (B₁) of formula: BQ₁Q₂Q₃, B is a trivalent boronatom, and Q₁ to Q₃ are a halogen atom, a C1-20 hydrocarbon group, ahalogenated C1-20hydrocarbon group, a silyl group substituted with C1-20hydrocarbon, an C1-20 alkoxy group, or an amino group disubstituted withC1-20 hydrocarbon, and may be the same or different. Preferred Q₁ toQ₃are a halogen atom, a C1-20 hydrocarbon group, and a halogenated C1-20hydrocarbon group.

Examples of (B₁) include tris(pentafluorophenyl)borane,tris(2,3,5,6-tetrafluorophenyl)borane,tris(2,3,4,5-tetrafuluorophenyl)borane,tris(3,4,5-trifluorophenyl)borane, tris(2,3,4-trifluorophenyl)borane,and phenylbis(pentafluorophenyl)borane, and preferred istris(pentafluorophenyl)borane.

In the boron compound (B₂) of formula: Z⁺(BQ₁Q₂Q₃Q₄)⁻, Z⁺ is aninorganic or organic cation, B is a trivalent boron atom, and examplesof Q₁ to Q₄ include the same compound as those of Q₁ to Q₃.

In the compound of formula: Z⁺(BQ₁Q₂Q₃Q₄)⁻, examples of Z⁺ which is aninorganic cation include a ferrocenium cation, an alkyl-substitutedferrocenium cation, and a silver cation, and examples of Z⁺ which is anorganic cation include a triphenylmethyl cation. Examples of(BQ₁Q₂Q₃Q₄)⁻ include tetrakis(pentafluorophenyl)borate,tetrakis(2,3,5,6-tetrafluorophenyl)borate,tetrakis(2,3,4,5-tetrafluorophenyl)borate,tetrakis(3,4,5-trifluorophenyl)borate,tetrakis(2,2,4-trifluorophenyl)borate,phenylbis(pentafluorophenyl)borate, andtetrakis(3,5-bistrifluoromethylphenyl)borate.

Examples of the compound of formula: Z⁺ (BQ₁Q₂Q₃Q₄)⁻ include ferroceniumtetrakis(pentafluorophenyl)borate, 1,1′-dimethylferroceniumtetrakis(pentafluorophenyl)borate, silvertetrakis(pentafluorophenyl)borate, triphenylmethyltetrakis(pentafluorophenyl)borate, and triphenylmethyl tetrakis(3,5-bistrifluoromethylphenyl)borate, and preferred is triphenylmethyltetrakis(pentafluorophenyl)borate.

In addition, in the boron compound (B₃) of formula: (L-H)⁺(BQ₁Q₂Q₃Q₄)⁻,L is a neutral Lewis base, (L-H)⁺ is a Brönsted acid, B is a trivalentboron atom, and examples of Q₁ to Q₄ include the same compounds as thoseof Q₁ to Q₃ in (B₁).

In the compound of formula: (L-H)⁺(BQ₁Q₂Q₃Q₄)⁻, examples of (L-H)⁺ whichis a Brösted acid include trialkyl-substituted ammonium,N,N-dialkylanilinium, dialkylammonium, and triarylphosphonium, andexamples of (BQ₁Q₂Q₃Q₄)⁻ include the same ions as those described above.

Examples of the compound of formula: (L-H)⁺(BQ₁Q₂Q₃Q₄)⁻ includetriethylammonium tetrakis(pentafluorophenyl)borate, tripropylammoniumtetrakis(pentafluorophenyl)borate, tri(normal butyl)ammonium tetrakis(pentafluorophenyl)borate, tri(normal butyl)ammoniumtetrakis(3,5-bistrifluoromethyphenyl)borate, N,N-dimethylaniliniumtetrakis(pentafluorophenyl)borate, N,N-diethylaniliniumtetrakis(pentafluorophenyl)borate, N,N-2,4,6-pentamethylaniliniumtetrakis(pentafluorophenyl)borate, N,N-dimethylaniliniumtetrakis(3,5-bistrifluoromethylphenyl)borate, diisopropylammoniumtetrakis(pentafluorophenyl)borate, dicyclohexylammoniumtetrakis(pentafluoro)borate, triphenylphosphoniumtetrakis(pentafluorophenyl)borate, tri(methylphenyl)phosphoniumtetrakis(pentafluorophenyl)borate, tri(dimethylphenyl)phosphoniumtetrakis(pentafluorophenyl)borate, preferably tri(normal butyl)ammoniumtetrakis(pentafluorophenyl)borate, and N,N-dimethylaniliniumtetrakis(pentafluorophenyl)borate.

The amount of each catalyst component is suitably set so that a molarratio of compound (A)/transition metal complex (1) is usually in a rangeof 0.1 to 10000, preferably 5 to 2000, and a molar ratio of compound(B)/transition metal complex (1) is usually in a range of 0.01 to 100,preferably 0.5 to 10.

Regarding the concentration when each catalyst component is used in asolution state, it is desirable to use each component so that theconcentration of the transition metal complex (1) is usually in a rangeof 0.0001 to 5 mmol/liter, preferably in a range of 0.001 to 1mmol/liter, and that of the compound (A) is usually in a range of 0.01to 500 mmol/liter, preferably in a range of 0.1 to 100 mmol/liter interms of an Al atom, and that of the component (B) is in a range of0.0001 to 5 mmol/liter, preferably in a range of 0.001 to 1 mmol/liter.

In the present invention, as a monomer used for polymerization, any ofolefin and diolefin having 2 to 20 carbon atoms can be used, and two ormore kinds of monomers may be used at the same time. The monomer will beexemplified below, but the present invention is not limited to thefollowing compounds. Examples of the olefin include ethylene, propylene,butene-1, pentene-1, hexene-1, heptene-1, octene-1, nonene-1,decene-1,5-methyl-2-pentene-1, and vinylcyclohexene.

Examples of the diolefin compound include a conjugated diene andnon-conjugated diene hydrocarbon compounds and, specific examples of thecompound include the non-conjugated diene compound such as1,5-hexadiene, 1,4-hexadiene, 1,4-pentadiene, 1,7-octadiene,1,8-nonadiene, 1,9-decadiene, 4-methyl-1,4-hexadiene,5-methyl-1,4-hexadiene, 7-methyl-1,6-octadiene,5-ethylidene-2-norbornene, dicyclopentadiene, 5-vinyl-2-norbornene,5-methyl-2-norbornene, norbornadiene, 5-methylene-2-norbornene,1,5-cyclooctadiene, or 5,8-endomethylenehexahydronaphthalene, and theconjugated diene compound such as 1,3-butadiene, isoprene,1,3-hexadiene, 1,3-octadiene, 1,3-cyclooctadiene, or 1,3-cyclohexadiene.

Examples of the monomers constituting a copolymer include a combinationof ethylene and propylene, ethylene and butene-1, ethylene and hexene-1,and propylene and butene-1, and a combination using further5-ethylidene-2-norbornene in the combinations above, but the presentinvention is not limited to the above compounds.

In the present invention, as a monomer, an aromatic vinyl compound maybe used. Examples of an aromatic vinyl compound include styrene,o-methylstyrene, m-methylstyrene, p-methylstyrene, o,p-dimethylstyrene,o-ethylstyrene, m-ethylstyrene, p-ethylstyrene, o-chlorostyrene,p-chlorostyrene, α-methylstyrene, and divinylbenzene.

The polymerization method is not particularly limited, but solventpolymerization or slurry polymerization using, as a solvent, analiphatic hydrocarbon such as butane, pentane, hexane, heptane oroctane, an aromatic hydrocarbon such as benzene or toluene, orhalogenated hydrocarbon such as methylene dichloride, or vapor phasepolymerization of a gaseous monomer is possible, and any of continuouspolymerization and batch-type polymerization can be applied.

The polymerization temperature can be in a range of −50° C. to 200° C.,in particular, preferably in a range of around −20° C. to 100° C., and apolymerization pressure is preferably normal pressure to 6 MPa (60kg/cm² G). A polymerization time is generally selected appropriatelydepending on a kind of an objective polymer, and a reaction apparatus,and can be in a range of 1 minute to 20 hours. In addition, in thepresent invention, a chain transfer agent such as hydrogen may be addedin order to regulate a molecular weight of a copolymer.

EXAMPLES

The present invention will be explained in more detail below by way ofExamples, but the present invention is not limited to these Examples.Nature of polymers in Examples was measured by the following methods.

[Molecular Weight and Molecular Weight Distribution]

A molecular weight and a molecular weight distribution were measuredunder the following condition using RapidGPC.

-   Pumping apparatus: (LC pump) manufactured by Gilson, Inc., Model1305    (pump head 25.SC)-   Column: manufactured by PolymerLaboratories (PL), PLgel Mixed-B 10    μm, 7.5 mmφ×300 mm-   Mobile phase: o-dichlorobenzene-   Dissolution solvent: 1,2,4-trichlorobenzene-   Flow rate: 2 ml/min-   Column temperature: 160° C.-   Calibration line: PL standard polystyrene (PS) 8 samples, (standard    PS molecular weight) 5,000, 10,050, 28,500, 65,500, 185,400,    483,000, 1,013,000, 3,390,000    [Melting Point]

A melting point was measured under the following condition using SAMMS(Sensor Array Modular System) (manufactured by Symyx Technologies,Inc.).

-   Measurement mode: Melting temperature measurement by heat capacity    spectroscopy-   Atmosphere gas: vacuum condition (3.0×10⁻⁴ Torr or less)-   Temperature problem: (Start) room temperature, (Temperature raising    rate) about 50° C./min, (Holding) 200° C.(0 min)    [Me Branching]

Me branching was measured under the following condition using IR(EQUINOX55 manufactured by Bruker).

-   Measurement mode: reflection transmission method (formation of film    on mirror plane)-   Blank: mirror plane (Air)-   Measurement condition: (Resolution) 2 cm⁻¹, (Accumulated time) 128    times, (Wavelength) 400 to 4000 cm⁻¹

Synthesis Example Example 1 Synthesis of2,2′-(phenylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromium chloride

To a solution (2.94 mL) of NaH (0.20 g, 5.00 mmol) in tetrahydrofuranwas added dropwise a solution (3.91 mL) ofbis(2-hydroxy-3-tert-butyl-5-methylphenyl)phenylphosphine (0.43 g, 1.00mmol) in tetrahydrofuran at 0° C., and the mixture was stirred at roomtemperature for 3 hours. Excessive NaH was removed by filtration, and asolution (2.94 mL) of CrCl₃ (THF)₃ (0.37 g, 1.00 mmol) intetrahydrofuran was added dropwise to the filtrate at 0° C. The mixturewas stirred at room temperature for 10 hours, the solvent was distilledoff under reduced pressure, toluene (10.0 mL) was added, insolubles werefiltered off, and the filtrate was distilled off under reduced pressureto quantitatively obtain2,2′-(phenylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromium chlorideas a green solid.

MS spectrum (EI) 519 (M⁺)

Example 2 Synthesis ofbis(2-methoxymethoxy-3-tert-butyl-5-methylphenyl)(tert-butyl)phosphine

To a solution (28.1 mL) of 2-tert-butyl-1-methoxymethoxy-4-methylbenzene(4.17 g, 20 mmol) in tetrahydrofuran was added a 1.57 M solution (15.3mL) of n-butyllithium in hexane at 0° C., and the temperature was raisedto room temperature, followed by stirring for 1 hour. To the reactionmixture was added a solution (18.8 mL) of tert-butyldichlorophosphine(1.75 g, 11.0 mmol) in tetrahydrofuran at 0° C., and the mixture wasstirred at room temperature for 15 hours. The solvent was distilled offunder reduced pressure, toluene (20.0 mL) was added, insolubles werefiltered off, and the filtrate was concentrated under reduced pressureto quantitatively obtainbis(2-methoxymethoxy-3-tert-butyl-5-methylphenyl)(tert-butyl)phosphineas a yellow liquid.

¹H NMR (C₆D₆) δ1.30(d, J=12.4 Hz, 9H), 1.51(18H), 2.12(6H), 3.52(6H),5.46-5.72(4H), 7.16(2H), 7.30(2H)

³¹P NMR (C₆D₆) δ−4.2

Example 3 Synthesis ofbis(2-hydroxy-3-tert-butyl-5-methylphenyl)(tert-butyl)phosphine)

To an ethyl acetate/methanol=1/1 solution (60 mL) ofbis(2-methoxymethoxy-3-tert-butyl-5-methylphenyl)(tert-butyl)phosphine(1.01 g, 2 mmol) was added acetyl chloride (0.79 g, 10.0 mmol) at roomtemperature, and the mixture was stirred at room temperature for 15hours. The solvent was distilled off under reduced pressure toquantitatively obtainbis(2-hydroxy-3-tert-butyl-5-methylphenyl)(tert-butyl)phosphine as apale yellow solid.

¹HNMR(C₆D₆) δ 1.31(9H), 1.44(18H), 2.36(6H), 7.32(2H) 7.49(2H) ³¹PNMR(C₆D₆) δ−2.3

Example 4 Synthesis of2,2′-(tert-butylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromiumchloride

To a solution (2.70 mL) of NaH (0.18 g, 4.43 mmol) in tetrahydrofuranwas added a solution (3.60 mL) ofbis(2-hydroxy-3-tert-butyl-5-methylphenyl)(tert-butyl)phosphine (0.40 g,0.89mmol) in tetrahydrofuran at 0° C., and the mixture was stirred atroom temperature for 3 hours. Excessive NaH was removed by filtration,and a solution (2.70 mL) of CrCl₃ (THF)₃ (0.33 g, 0.89 mmol) intetrahydrofuran was added dropwise to the filtrate at 0° C. The mixturewas stirred at room temperature for 10 hours, the solvent was distilledoff under reduced pressure, toluene (10.0 mL) was added, the insolubleswere filtered off, and the filtrate was distilled off under reducedpressure to obtain 381.1 mg of2,2′-(tert-butylphosphido)bis(2-tert-butyl-4-methylphenoxy)chromiumchloride as a green solid.

MS spectrum (EI) 499 (M−1)

Example 5 Polymerization

5.0 mL of toluene was placed into a 23.5 mL autoclave under nitrogen,and stabilized at 40° C., and then ethylene was pressurized to 0.60 MPatherein and stabilized. Methylaluminoxane (100 μmol), and2,2′-(phenylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromium chloride(0.10 μmol) were added thereto to perform polymerization for 30 minutes.As a result of polymerization, 1.08×10⁷ g of a polymer was prepared per1 mol of chromium an hour.

Example 6

According to the same manner as that of Example 5 except that a solutionof triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku) andpentafluorophenylborane (0.30 μmol) were used in place ofmethylaluminoxane, polymerization was performed. As a result ofpolymerization, 4.00×10⁶ g of a polymer was prepared per 1 mol ofchromium an hour.

Example 7

According to the same manner as that of Example 5 except that a solutionof triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku) anddimethylanilinium tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 1.70×10⁷ g of a polymer was prepared per 1 molof chromium an hour.

Example 8

According to the same manner as that of Example 5 except that a solutionof triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku) andtriphenylmethyl tetrakis(pentafluorophenyl)borate (0.30 μmol) were usedin place of methylaluminoxane, polymerization was performed. As a resultof polymerization, 7.72×10⁷ g of a polymer was prepared per 1 mol ofchromium an hour.

Example 9

5.0 mL of toluene and 1-hexene (50 μL) were placed into a 23.5 mLautoclave under nitrogen, and stabilized at 40° C., and then ethylenewas pressurized to 0.60 MPa therein and to stabilized. Methylaluminoxane(100 μmol),2,2′-(phenylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromium chloride(0.10 μmol) were added thereto, followed by polymerization for 30minutes. As a result of polymerization, 1.11×10⁷ g of a polymer having amolecular weight (Mw)=2.33×10⁶, a molecular weight distribution(Mw/Mn)=2.0, a melting point (Tm)=117.7° C., and Me branching of 9 per1000 carbons was prepared per 1 mol of chromium an hour.

Example 10

According to the same manner as that of Example 9 except that a solutionof triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku) andpentafluorophenylborane (0.30 μmol) were used in place ofmethylaluminoxane, polymerization was performed. As a result ofpolymerization, 7.40×10⁶ g of a polymer having a molecular weight(Mw)=1.19×10⁴, a molecular weight distribution (Mw/Mn)=1.9, a meltingpoint (Tm)=112.9° C., and Me branching of 8 per 1000 carbons wasprepared per 1 mol of chromium an hour.

Example 11

According to the same manner as that of Example 9 except that a solutionof triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku) anddimethylanilinium tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 4.72×10⁷ g of a polymer having a molecularweight (Mw)=9.74×10³, a molecular weight distribution (Mw/Mn)=2.0, amelting point (Tm)=120.4° C., and Me branching of 14 per 1000 carbonswas prepared per 1 mol of chromium an hour.

Example 12

According to the same manner as that of Example 9 except that a solutionof triusobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku) andtriphenylmethyl tetrakis(pentafluorophenyl)borate (0.30 μmol) were usedin place of methylaluminoxane, polymerization was performed. As a resultof polymerization, 5.82×10⁷ g of a polymer having a molecular weight(Mw)=2.71×10³, a molecular weight distribution (Mw/Mn)=4.6, a meltingpoint (Tm)=121.5° C. and Me branching of 17 per 1000 carbons wasprepared per 1 mol of chromium an hour.

Example 13

5.0 mL of toluene and 1-hexene (50 μL) were placed into a 23.5 mLautoclave under nitrogen, and stabilized at 70° C., and then ethylenewas pressurized to 0.60 MPa therein and stabilized.Pentafluorophenylborane (0.30 μmol) and2,2′-(phenylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromium chloride(0.10 μmol) were added thereto, followed by polymerization for 30minutes. As a result of polymerization, 2.06×10⁷ g of a polymer having amolecular weight (Mw)=3.3×10³, a molecular weight distribution(Mw/Mn)=1.8, a melting point (Tm)=131° C., and Me branching of 4 per1000 carbons was prepared per 1 mol of chromium an hour.

Example 14

5.0 mL of toluene was placed into a 23.5 mL autoclave under nitrogen,and stabilized at 40° C., and then ethylene was pressurized to 0.60 MPatherein and stabilized. Methylaluminoxane (100 μmol) was placed therein,and a toluene solution obtained by mixingbis(2-hydroxy-3-tert-butyl-5-methylphenyl)phenylphosphine (0.20 μmol)and CrCl₃ (THF)₃ (0.20 μmol) at 25° C. for 1 minute was added, andpolymerization was carried out for 30 minutes. As a result ofpolymerization, 1.00×10⁵ g of a polymer was prepared per 1 mol ofchromium an hour.

Example 15

According to the same manner as that of Example 14 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and pentafluorophenylborane (0.30 μmol) were used in place ofmethylaluminoxane, polymerization was performed. As a result ofpolymerization, 8.10×10⁶ g of a polymer was prepared per 1 mol ofchromium an hour.

Example 16

According to the same manner as that of Example 14 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and dimethylanilinium tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 1.29×10⁷ g of a polymer was prepared per 1 molof chromium an hour.

Example 17

According to the same manner as that of Example 14 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and triphenylmethyl tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 4.87×10⁷ g of a polymer was prepared per 1 molof chromium an hour.

Example 18

5.0 mL of toluene was placed into a 23.5 mL autoclave under nitrogen,and stabilized at 40° C., and then ethylene was pressurized to 0.60 MPatherein and stabilized. Methylaluminoxane (100 μmol) was placed therein,and a toluene solution obtained by mixingbis(2-hydroxy-3-tert-butyl-5-methylphenyl)phenylphosphine (0.40 μmol)and CrCl₃ (THF)₃ (0.20 μmol) at 25° C. for 1 minute was added, andpolymerization was carried out for 30 minutes. As a result ofpolymerization, 1.00×10⁵ g of a polymer was prepared per 1 mol ofchromium an hour.

Example 19

According to the same manner as that of Example 18 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and pentafluorophenylborane (0.30 μmol) were used in place ofmethylaluminoxane, polymerization was performed. As a result ofpolymerization, 9.80×10⁶ g of a polymer was prepared per 1 mol ofchromium an hour.

Example 20

According to the same manner as that of Example 18 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and dimethylanilinium tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 1.41×10⁷ g of a polymer was prepared per 1 molof chromium an hour.

Example 21

According to the same manner as that of Example 18 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and triphenylmethyl tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 7.98×10⁷ g of a polymer was prepared per 1 molof chromium an hour.

Example 22

5.0 mL of toluene was placed into a 23.5 mL autoclave under nitrogen,and stabilized at 40° C., and then ethylene was pressurized to 0.60 MPatherein and stabilized. Methylaluminoxane (100 μmol), and2,2′-(tert-butylphosphido)bis(2-tert-butyl-4-methylphenoxy) chromiumchloride (0.10 μmol) were added thereto, and polymerization was carriedout for 30 minutes. As a result of polymerization, 1.33×10⁷ g of apolymer was prepared per 1 mol of chromium an hour.

Example 23

According to the same manner as that of Example 22 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and pentafluorophenylborane (0.30 μmol) were used in place ofmethylaluminoxane, polymerization was performed. As a result ofpolymerization, 1.00×10⁵ g of a polymer was prepared per 1 mol ofchromium an hour.

Example 24

According to the same manner as that of Example 22 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and dimethylanilinium tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 2.12×10⁷ g of a polymer was prepared per 1 molof chromium an hour.

Example 25

According to the same manner as that of Example 22 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and triphenylmethyl tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 1.65×10⁸ g of a polymer was prepared per 1 molof chromium an hour.

Example 26

5.0 mL of toluene and 1-hexene (50 μL) were placed into a 23.5 mLautoclave under nitrogen, and stabilized at 40° C., and then ethylenewas pressurized to 0.60 MPa therein and stabilized. Methylaluminoxane(100 μmol) and2,2′-(tert-butylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromiumchloride (0.10 μmol) were added thereto, and polymerization was carriedout for 30 minutes. As a result of polymerization, 1.11×10⁷ g of apolymer having a molecular weight (Mw)=7.30×10³, a molecular weightdistribution (Mw/Mn)=2.0, a melting point (Tm)=114.5° C., and Mebranching of 32 per 1000 carbons was prepared per 1 mol of chromium anhour.

Example 27

According to the same manner as that of Example 26 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and pentafluorophenylborane (0.30 μmol) were used in place ofmethylaluminoxane, polymerization was performed. As a result ofpolymerization, 1.00×10⁵ g of a polymer was prepared per 1 mol ofchromium an hour.

Example 28

According to the same manner as that of Example 26 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and dimethylanilinium tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 2.77×10⁷ g of a polymer having a molecularweight (Mw)=9.00×10³, a molecular weight distribution (Mw/Mn)=1.7, amelting point (Tm)=117.7° C., and Me branching of 23 per 1000 carbonswas prepared per 1 mol of chromium an hour.

Example 29

According to the same manner as that of Example 26 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and triphenylmethyl tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 1.59×10⁸ g of a polymer having a molecularweight (Mw)=8.30×10³, a molecular weight distribution (Mw/Mn)=1.7, amelting point (Tm)=116.6° C., and Me branching of 20 per 1000 carbonswas prepared per 1 mol of chromium an hour.

Example 30

5.0 mL of toluene and 1-hexene (50 μL) were placed into a 23.5 mLautoclave under nitrogen, and stabilized at 70° C., and then ethylenewas pressurized to 0.60 MPa therein and stabilized. Methylaluminoxane(100 μmol) and2,2′-(tert-butylphosphido)bis(6-tert-butyl-4-methylphenoxy)chromiumchloride (0.10 μmol) were added thereto, and polymerization was carriedout for 30 minutes. As a result, 9.00×10⁵ g of a polymer was preparedper 1 mol of chromium an hour.

Example 31

According to the same manner as that of Example 30 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and dimethylanilinium tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 4.10×10⁶ g of a polymer having a molecularweight (Mw)=4.00×10³, a molecular weight distribution (Mw/Mn)=1.5, amelting point (Tm)=122.1° C. and Me branching of 27 per 1000 carbons wasprepared per 1 mol of chromium an hour.

Example 32

According to the same manner as that of Example 30 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and triphenylmethyl tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 4.87×10⁷ g of a polymer having a molecularweight (Mw)=6.50×10³, a molecular weight distribution (Mw/Mn)=1.53, amelting point (Tm)=123.10C., and Me branching of 15 per 1000 carbons wasprepared per 1 mol of chromium an hour.

Example 33

5.0 mL of toluene and 1-hexene (50 μL) were placed into a 23.5 mLautoclave under nitrogen, and stabilized at 130° C., and then ethylenewas pressurized to 0.60 Mpa therein and stabilized. Methylaluminoxane(100 μmol) and2,2′-(tert-butylphosphido)bis(6-tert-butyl-4-methylphenoxy) chromiumchloride (0.10 μmol) were added thereto, and polymerization was carriedout for 30 minutes. As a result of polymerization, 5.00×10⁵ g of apolymer was prepared per 1 mol of chromium an hour.

Example 34

According to the same manner as that of Example 33 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and dimethylanilinium tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 3.00×10⁵ g of a polymer was prepared per 1 molof chromium an hour.

Example 35

According to the same manner as that of Example 33 except that asolution of triisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku)and triphenylmethyl tetrakis(pentafluorophenyl)borate (0.30 μmol) wereused in place of methylaluminoxane, polymerization was performed. As aresult of polymerization, 6.00×10⁵ g of a polymer was prepared per 1 molof chromium an hour.

Comparative Example 1

5.0 mL of toluene was placed into a 23.5 mL autoclave under nitrogen,and stabilized at 40° C., and then ethylene was pressurized to 0.60 MPatherein and stabilized. A solution of triisobutylaluminum in hexane (40μL, 1.0 M, Kanto Kagaku), triphenylmethyl tetrakis(pentafluorophenyl)borate (0.30 μmol) and2,2′-(phenylphosphido)bis(6-tert-butyl-4-methylphenoxy)(tetrahydrofuran)titaniumdichloride (0.10 μmol) were added thereto, and polymerization wascarried out for 30 minutes. As a result of polymerization, 1.30×10⁶ g ofa polymer was prepared per 1 mol of titanium an hour.

Comparative Example 2

5.0 mL of toluene and 1-hexene (50 μL) were placed into a 23.5 mLautoclave under nitrogen, and stabilized at 40° C., and then ethylenewas pressurized to 0.60MPa therein and stabilized. A solution oftriisobutylaluminum in hexane (40 μL, 1.0 M, Kanto Kagaku),dimethylanilinium tetrakis(pentafluorophenyl)borate (0.30 μmol) and2,2′-(phenylphosphido)bis(6-tert-butyl-4-methylphenoxy)(tetrahydrofuran)titaniumdichloride (0.10 μmol) were added thereto, and polymerization wascarried out for 30 minutes. As a result of polymerization, 7.00×10⁵ g ofa polymer was prepared per 1 mol of titanium an hour.

INDUSTRIAL APPLICABILITY

Using a transition metal complex obtained by the present invention as acatalytic component, polyolefin can be prepared with better catalystactivity.

1. A transition metal complex of formula (2):

wherein M represents Cr, Y represents a substituted or unsubstitutedC1-10 alkyl group, a substituted or unsubstituted C7-20 aralkyl group, asubstituted or unsubstituted C6-20 aryl group, a silyl group substitutedwith substituted or unsubstituted C1-20 hydrocarbon, R¹, R², K³, R⁴, R⁵,R⁶, R⁷ and R⁸ are the same or different and represent a hydrogen atom, ahalogen atom, an C1-10 alkyl group, an C1-10 alkoxyl group, or a silylgroup substituted with C1-20 hydrocarbon, X¹ and X² are the same ordifferent, and represent a hydrogen atom, a halogen atom, a substitutedor unsubstituted C1-10 alkyl group, a substituted or unsubstituted C7-20aralkyl group, a substituted or unsubstituted C6-20 aryl group, asubstituted or unsubstituted C1-10 alkoxy group, a substituted orunsubstituted C7-20 aralkyloxy group, a substituted or unsubstitutedC6-20 aryloxy group, or an amino group disubstituted C1-20 hydrocarbon,and n¹ is an integer of 0 to
 3. 2. The transition metal complexaccording to claim 1 wherein Y is a substituted or unsubstituted C1-10alkyl group, or a substituted or unsubstituted C6-20 aryl group.
 3. Anolefin polymerization catalyst obtained by combining the transitionmetal complex as defined in claim 1 or 2 with the following compound(A), Compound (A): any one of the following compounds (A₁) to (A₃), or amixture of two or more of them (A₁): an organic aluminum compound offormula (E₁)_(a)Al(Z′)(_(3-a)), (A₂): cyclic aluminoxane having astructure of formula {—Al(E₂)-O—}_(b), (A₃): linear aluminoxane having astructure of formula (E₃){—Al(E₃)-O—}_(c)Al(E₃)₂ wherein B₁ to B₃ arethe same or different, and represent a C1-8 hydrocarbon group, Z′s arethe same or different, and represent a hydrogen atom or a halogen atom,a represents 1,2 or 3, b is an integer of 2 or more, and c represents aninteger of 1 or more.
 4. The olefin polymerization catalyst according toclaim 3, which is obtained by further combining the following compound(B), Compound (B): any one of the following compounds (B₁) to (B₃), or amixture of two or more of them (B₁): a boron compound of formulaBQ₁Q₂Q₃, (B₂): a boron compound of formula Z⁺(BQ₁Q₂Q₃Q4)⁻, (B₃): a boroncompound of formula (L-H)⁺(BQ₁Q₂Q₃Q₄)⁻, wherein B is a trivalent boronatom, Q₁ to Q₄ are the same or different and represent a halogen atom, aC1-20 hydrocarbon group, a halogenated C1-20 hydrocarbon group, a silylgroup substituted with C1-20 hydrocarbon, an C1-20 alkoxy group, or anamino group disubstituted with C1-20 hydrocarbon, Z⁺ represents aninorganic or organic cation, and L represents a neutral Lewis base.
 5. Aprocess for preparing an olefin polymer, which comprises polymerizingolefin by contacting an olefin with an olefin polymerization catalyst asdefined in claim
 3. 6. A process for preparing an olefin polymer, whichcomprises polymerizing olefin by contacting an olefin with the olefinpolymerizing catalyst as defined in claim 4.